Pool brush



FIG. 1 is a front-bottom-right perspective view of a pool brush, showing my new design;

FIG. 2 is a front-top-right perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the figures illustrate portions of the pool brush that form no part of the claimed design. 

CLAIM The ornamental design for a pool brush, as shown and described. 